New MacBook 2018 - Thunderbolt 2 Dock

Hi everyone,

I recently bought the new Macbook Pro 2018 15Inch Laptop with the 560X GPU. I have an older Thunderbolt 2 Belkin dock running my peripherals so I went for the original Apple Thunderbolt 3.1 Type C Adapter to Thunderbolt 2 - and now there are 2 Problems.

1. If I'm connecting the macbook to the dock and then going to my monitor (LG 34Inch Ultrawide Curved 3440x1440p) with a thunderbolt 2 cable coming from the dock then the display is really blurry and not as color accurate as it was before with my old macbook pro 2014 via thunderbolt 2.

- So I tried something else

2. I connected the monitor over the dock with an HDMI cable and there we go, everything is sharp and nice but sometimes the monitor is like split in to parts and the right halve is causing issues to videos playback and when moving windows (see the attached video) - as soon as I'm disconnecting the the dock from the macbook bock and reconnecting it the issue is gone.

YouTube

The macbook pro is always in clemshell mode when using the external monitor.

Any ideas?

Thanks and cheers

Steffen